Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/aos/events/simulated_network_bridge.h b/aos/events/simulated_network_bridge.h
index faa6398..14a7321 100644
--- a/aos/events/simulated_network_bridge.h
+++ b/aos/events/simulated_network_bridge.h
@@ -8,8 +8,7 @@
 #include "aos/network/remote_message_generated.h"
 #include "aos/network/timestamp_channel.h"
 
-namespace aos {
-namespace message_bridge {
+namespace aos::message_bridge {
 
 class RawMessageDelayer;
 
@@ -235,7 +234,6 @@
   std::vector<std::unique_ptr<DelayersVector>> delayers_list_;
 };
 
-}  // namespace message_bridge
-}  // namespace aos
+}  // namespace aos::message_bridge
 
 #endif  // AOS_EVENTS_SIMULATED_NETWORK_BRIDGE_H_